Concrete Technology for Transportation Applications (2019) / Chapter Skim
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Pages 92-101
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92 Introduction A survey was prepared and sent electronically using online survey software to all members of the ASSHTO Committee on Materials and Pavements (COMP) representing the 50 state highway agencies and the District of Columbia.
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Survey of State Practices 93 Concrete Technologies This topic included seven questions concerning 14 concrete technologies, including those that were the main focus of the synthesis, and others that were not but were still considered important technologies. The surveyed technologies were SCC, UHSC, HESC, PC, RCC, UHPC, ICC, TCMC, lightweight concrete (LC)
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94 Concrete Technology for Transportation Applications Pervious concrete (PC) 14 DE, FL, IL, KY, ME, MN, NH, NY, OR, PA, RI, VT, WA, WY 8 DE, MN, NH, NY, PA, VT, WA, WY Recycled concrete aggregate (RCA)
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Survey of State Practices 95 HESC (in 27 states) , LC (in 27 states)
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96 Concrete Technology for Transportation Applications admixtures and nanomaterials to improve concrete properties and/or reduce shrinkage and cracking, performance-based mix designs, fibers, innovative deicing technologies, high-friction surface treatments, nontraditional SCMs, and nontraditional cementitious overlay and repair materials. Among the 40 responding DOTs, 14 states have worked on other technologies in experimental or implementation stage, and indicated the technology use in pavements and/or structural applications.
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Survey of State Practices 97 • Delaware and West Virginia have implemented, with success, the high surface friction technology. • Florida is developing concrete mixtures using recycled asphalt, while Missouri is using RCAs in pavement mixtures.
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98 Concrete Technology for Transportation Applications a shortage of quality aggregates in the future. The remaining 24 states did not have an issue with quality aggregate availability now nor predicted a shortage in the future.
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Survey of State Practices 99 ash that is used in concrete mixtures to enhance the long-term durability of structures. In this section of the questionnaire, states were asked whether they are experiencing a shortage of fly ash, presently or predict future shortages.
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100 Concrete Technology for Transportation Applications The responses point to important gaps in technology transfer to assist some states in implementation of new and innovative concrete technologies. Other barriers to implementation include fragmented training efforts, negative perception of reliability, concerns about mixture integrity and long-term performance, industry and agency reluctance, as well as cost and time availability to pay attention to new technologies.
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Survey of State Practices 101 An encouraging 24 respondents indicated willingness for additional interviews to prepare case examples for their respective states. Five case examples were received from Florida, Illinois, Missouri, New York, and Tennessee, and are presented in Chapter 4.
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